Piano-stool



(No Mode l.)

O. E. CUNNINGHAM & W. D. WARNIOK.

.PIANO STOOL.

.No. 431,803. Patehted July 8, 1890.

WITNESSES: mvEmEoR s M! W ZJWWV' BY CAM mwu ATTORNEY.

UNITED STATES PATENT OFF CE.

CHARLES E. CUNNINGHAM AND WILLIAM D. \VARNICK, OF BALTIMORE, MARYLAND.

PIANO-STOOL...

SPECIFICATION forming part of Letters Patent No. 431,803, dated July 8,1890.

Application filed April 14, 1890.

To all whom it may concern:

Be it known that we, CHARLES E. CUN- NINGHAM and WILLIAM D. XVARNICK,citizens of the United States, residing at Baltimore, in the State ofMaryland, have invented certain new and useful Improvements inPiano-Stools, of which the following is a specification.

This invention relates to an improvement in piano-stools, and has forits object to provide such construction as will enable the seat of thestool tobe raised or lowered without the necessity of twirling the seat,as is the case where the screw is used.

The construction whereby the desired result is accomplished will bedescribed in connection with the accompanying drawings, in which- Figure1 is a sectional elevation of the stool. Fig. 2 is a sectional view ofpart of same on larger scale. Fig. 3 is a sectional view on line 3 3 ofFig. 1. Fig. 4 is a top view of the postcap. Fig.5 is a side view of thepivot-bar.

The letter A designates the seat, B the stand or base, and C the legs.The stand or base B, has a cavity 12 through its center, so as toreceive the racked bar D, which is attached to the seat A. This cavityor bore is part round and has at one side asquare-shaped groove 1). Theracked bar D fits snugly therein, the tooth part cl occupying the squarepart b, as shown in Fig. 3. A vertical lever e is pivoted to the base Bat e, and its upper end passes through a side hole a in the base B andengages with the racked bar D. A spring 6 is fastened by one end in thebase and presses against the lower end of the lever 6, so as to keep theupper end engaged with the racked bar D. The racked bar D has two kindsof teeth-slip-teeth d and stop-teeth (1 The slip-teeth d are halfV-shaped-that is, their under side projects laterally at a right angleto the vertical bar and their upper side has a downward incline. Thelower right-angled side of a slip-tooth d, resting on the upper end ofthe lever 8, will sustain the seat, and when it is desired to raise orelevate the seat A it is only necessary to grasp the seat and lift it,whereupon the downward incline of the upper side of the teeth (1' willslip up over the end of the lever 6. At certain intervals- Serial No.347,8t36. (No model.)

say every fifth slip-toothis a stop-tooth d These have a straightlateral under side like the other teeth, but have a reverse inclinedupper side-that is, the upper side inclines upward instead of downward.These stopteeth d will not slip either up or down past the end of thelever e.

In order to give the seat A a revolving motion without causing it toraise or lower, the upper end of the racked bar is provided with anaxial bore f, into which is fitted tight a cone-shaped steel bearing f.Attached to the seat A is a metal plate g, to which a pivot-bar h isfixed rigidly. This pivot-bar has a concaved end socket h, which fitssnugly over the cone-bearing f This pivot-bar It occupies the axial boref and revolves therein on the steel cone-bearing f. The pivot-bar h isprovided with an annular groove '5, and

Ya screw z" passes through the wall of the bore f in the upper end ofthe racked bar D, and

engages in said groove 1'. A metal cap it fits on each end of thebase-post B, and has openings through which the racked bar passes.

The operation of the stool is as follows: To elevate it to any desiredheight the seat is merely raised by the hands. WVhen desiring to lowerthe seat, thelower end of the lever is depressed, which disengages itfrom the racked bar D. The precise construction and arrangement of thislever are immaterial, as it may be so arranged as to be within reach ofand worked by the hands instead of by the foot. This construction of theracked bar and the lever may be used also in chairs.

Having described our invention, we claim- 1. The combination of a rackedbar D, provided with two kinds of teeth-to wit, slip teeth d, having aright-angled under side and a downwardly inclined upper side, andstopteeth 61 having a right-angled under side and an upwardly-inclinedupper side, a seat A, pivoted freely on-the upper end of said rackedbar, a base provided with a Vertical cavity for the racked bar, and alever pivoted on 5 the base and engaging the said teeth on the rackedbar, as shown and described.

2. The combination of a racked bar D, provided with two kinds ofteeth-to wit, slipteeth (1' and stop-teeth (Z and having at its ICQupper end an axial bore f, fitted with a cone- In testimony whereof weafiix our signashaped bearing f, a seat A, provided with a tures in thepresence of two witnesses. pivot-bar which occupies the axial bore andCHARLES E. CUNNINGHAM. revolves on the said cone-bearing", and alever"XVILLIAM D. XVARNICK.

5 pivoted on the base and engaging the said \Yitnesses:

teeth on the racked bar, as shown and de- JOHN E. MORRIS,

scribed. v JNo. T. MADDoX.

